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ERC-2981, Operator Filter, and Closed Marketplace Approaches — NFT Royalty Enforcement Architecture — ERC-2981, Operator Filter, and Closed Marketplace Approaches
import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; import "@openzeppelin/contracts/interfaces/IERC2981.sol"; contract RoyaltyNFT is ERC721, IERC2981 { uint256 public constant ROYALTY_BPS = 750; // 7.5% address public royaltyRecipient; function royaltyInfo( uint256, // tokenId uint256 salePrice ) external view ov...
OpenSea introduced the Operator Filter: contracts could blacklist marketplaces that don't pay royalties. The Operator Filter Registry blocked transfers on zero-royalty platforms. Why it failed: Blur and other platforms deployed wrapper contracts that bypassed the filter. OpenSea eventually dropped their filter enforcem...
contract EnforcedRoyaltyNFT is ERC721 { address public immutable approvedMarketplace; // Only this address can transfer uint256 public constant ROYALTY_BPS = 750; address public royaltyRecipient; // Override transfer to enforce marketplace routing function _update(address to, uint256 tokenId, address auth) internal ove...
General-purpose PFP collection: ERC-2981 for marketplace compatibility. Accept that royalties are voluntary. Build community value that makes buyers want to support the creator. Gaming NFTs (items, characters): Closed marketplace architecture. In-game items naturally should trade within the game's economy. Royalties fu...
Common integrations: The Graph, Alchemy/Infura, OpenZeppelin Defender, and popular wallet providers.
Clarify requirements, compliance needs, architecture risks, and launch goals.
Implement core contracts, integrations, product flows, tests, and deployment automation.
Run QA, prepare audit handoff, deploy infrastructure, and support production rollout.
Not without a contract upgrade. The transfer restriction must be built into the original contract. If you want the option to enforce royalties later: build the marketplace restriction from the start but deploy with the `approvedMarketplace` set to address(0) (no restriction). Later, via governance vote, set the approved marketplace address — enabling enforcement.
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